Path fracture, unsp finger(s), subs for fx w malunion

This code signifies a pathological fracture of an unspecified finger that has healed incorrectly, resulting in a malunion. A pathological fracture occurs due to a disease process weakening the bone, rather than from trauma. The "subsequent encounter" indicates the patient is receiving follow-up care for the malunited fracture.

Apply this code when a patient presents for treatment or evaluation of a previously diagnosed pathological finger fracture that has healed in an anatomically incorrect position. Documentation should clearly state "pathological fracture," "finger(s)," "malunion," and indicate a follow-up visit for this specific condition.

• Ensure documentation specifies "pathological" fracture; otherwise, a traumatic fracture code may be more appropriate.
• Verify the encounter is for follow-up care of the malunion, not initial treatment or routine healing.
• If the specific finger is known, a more precise code (e.g., M84.441P-M84.445P) should be used.